Under photochemical conditions, will ring closure be conrotatory or disrotatory?

Organic Chemistry: A Guided Inquiry
2nd Edition
ISBN:9780618974122
Author:Andrei Straumanis
Publisher:Andrei Straumanis
Chapter5: Resonance
Section: Chapter Questions
Problem 7CTQ: On which do you expect to have a more intense and concentrated “hotspot” of negative charge:...
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Under photochemical conditions, will ring closure be conrotatory or disrotatory?

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Woodward–Hoffmann rules for electrocyclic reactions are,

 

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